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  • What is the accepted pattern for WPF commanding in MVVM?

    - by Robert S.
    I'm working on a WPF app and I understand the command pattern pretty well, but I've found that there are several different implementations of the command pattern for MVVM. There's Josh Smith's implementation in his WPF sample app, the DelegateCommand from Prism, and the CommandBindings implementation. My question is, what is the generally accepted best practice for using commands with MVVM? My application uses Prism so DelegateCommand is available to us. The devs on my team are arguing about which approach is "best." Some don't like the numerous .cs files generated for each command, others prefer that everything be wired up via CommandBindings. I'm at a loss. Can anyone shed some light?

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  • How to change pop view controller animation on back button ?

    - by Aryabhatt
    Hi all , I am pushing my view controller with the following statement : [[self navigationController] pushViewController:self.customViewController animatedWithTransition:UIViewAnimationTransitionFlipFromLeft]; Now when I am pressing the back button I want to animate it with the uiviewanimationtransitionflipfromright . like [self.navigationController popViewControllerAnimatedWithTransition:UIViewAnimationTransitionFlipFromLeft]; How Can I do so ? Thanks

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  • wpf - Which one is better? Style or User Control?

    - by Archie
    Hello, I wanted to know which one amongst Style and UserControl would be better to use in WPF? For example: I have created an image button in two different ways. One uses Style and ContentTemplate property is set. It uses one other class with dependency properties. The other way is i have created a UserControl which has a button and its content property is set. UserControl.xaml.cs file also contains the dependency properties. For Code details see the answers of this question: http://stackoverflow.com/questions/2734825/custom-button-template-in-wpf Which one would be better to use? Can anyone tell me in which scenario one should go for Style or UserControl or any CustomControl? Thanks in advance.

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  • Import animation DAE to Alternativa 3D

    - by Apollon1954
    Hi i have watched this tutorial from Roman Dedenis Alternativa 3D: Import and object animation DAE (Collada 3D Object) From: http://romaindedenis.over-blog.com/article-alternativa-3d-importer-objet-et-animation-dae-objet-3d-collada-66067921.html Im have implemented the program on flash and it's working fine on my computer. Then i exported it on my Android mobile device (Nexus One) using adobe AIR for Android but the animation doesn't appear on my mobile: Below i show screenshots of how it looks like on my pc and on my mobile. Printscreen from PC Printscreen from Android Phone device

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  • How do I work with WIndows Forms in WPF?

    - by xarzu
    How do I work with WIndows Forms in WPF? In my WPF program I created a Windows Form class. In this Form, I placed an OK button and I went into the properties of the button and set the DialogResult to OK. Now, I am calling this Dialog (Window Form) from the MainWindow.xaml.cs: dres = form.ShowDialog(); if (dres != DialogResult.OK) return; The compiler is complaining: Error 3 'System.Nullable<bool>' does not contain a definition for 'OK' and no extension method 'OK' accepting a first argument of type 'System.Nullable<bool>' could be found (are you missing a using directive or an assembly reference?)

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  • HTML 5 CANVAS ANIMATION

    - by cooldude
    Hi, I wanted to have an interface to allow the user to create animation on the browser using canvas element and then i have to save that animation and later reproduce that animation to the others users. Can anybody How can i do this. Please reply quickly . I have my deadline.

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  • Where should I put WPF specific code when using MVVM?

    - by Surfbutler
    I'm just getting up to speed on MVVM, but all the examples I've seen so far are binding View controls to simple non-WPF specific data types such as strings and ints. However in our app I want to be able to set a button's border brush based on a number in the Model. At the moment, I translate the number into a brush in the ViewModel to keep the View XAML only, but is that right? I don't like putting WPF specific code in the ViewModel, but equally I don't like the idea of putting code-behind on my View panel. Which is the best way? Thanks

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  • Differences between WPF Custom Control Library and plain Class Library?

    - by David Veeneman
    I posted a question a few months ago about sharing resource dictionaries across assemblies. It turns out you can do that using the Component Resource Key markup extension. At the time, I could only get it working with a WPF Custom Control project, not with a plain Class Library project. Now I need to use an existing plain Class Library project to host a shared resource dictionary. That means I need to retrofit the Class Library project to support the Component Resource Key markup extension. I have added a Themes folder and a Generic.xaml resource dictionary document to the Class Library project, as well as references to PresentationCore, PresentationFramework, and WindowsBase. Unfortunately, that doesn't seem to do the trick. So, here is my question: Other than the above, what does a WPF Custom Control Library project have that a plain Class Library project doesn't? Or, to put it another way, what else could I add to my class library project to get this feature working? Thanks.

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  • How can I get to the value of my WPF UserControl DependencyProperty from UI Automation Framework?

    - by Surfbutler
    Hi, I'm having trouble getting access to my WPF UserControl DependencyProperty values through the UI Automation Framework. I've used James McCaffreys article in MSDN as a starting point (Automating IO Tests in WPF Applications, MSDN March 2009), but I can only see properties etc in standard controls such as buttons. I'm assuming there's some Automation interface I have to implement on my UserControl, but what and how? I can already see my control fine e.g. in UISpy, but I can't see the dependency properties within it. Here's what my usercontrol looks like currently in UISpy: AutomationElement General Accessibility AccessKey: "" AcceleratorKey: "" IsKeyboardFocusable: "False" LabeledBy: "(null)" HelpText: "Switches 48v Phantom Power On/Off (for Mic inputs only)." State IsEnabled: "True" HasKeyboardFocus: "False" Identification ClassName: "" ControlType: "ControlType.Custom" Culture: "(null)" AutomationId: "V48SwL" LocalizedControlType: "custom" Name: "" ProcessId: "5684 (VirtualSix)" RuntimeId: "7 5684 40026340" IsPassword: "False" IsControlElement: "True" IsContentElement: "True" Visibility BoundingRectangle: "(140, 457, 31, 20)" ClickablePoint: "155,467" IsOffscreen: "False" ControlPatterns

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  • Why the same code in WPF is slower than in Windows Forms?

    - by Marco Bettiolo
    I made bunch of benchmarks of the framework 4.0 and older and I can't understand why the same code is slower when using WPF compared to Windows Forms: This is the code, it has nothing to do with the UI elements: Random rnd = new Random(845038); Int64 number = 0; for (int i = 0; i < 500000000; i++) { number += rnd.Next(); } The code takes 5968ms - 6024ms to execute in Windows Forms and 6953ms in WPF. Here is the post with the downloadable solution: http://blog.bettiolo.it/2010/04/benchmark-of-net-framework-40.html

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  • What JS framework offers scroll functionality (+animation) in a div without a scrollbar?

    - by montooner
    All: I want to scroll through a sequence of tumblr/twitter posts as a long sequence of texts. Let's say we have: <div id="mainContent"> _some content_ </div> where the css for mainContent is: #mainContent { padding: 20px 20px; background: #FFF; height:500px; overflow:hidden; } I really like the functionality of Scrollable jQuery, but they require pagination and an array of elements. I'm looking for tips in any of these categories: a js framework I can use to achieve this a solution to paginating the text

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  • Possible to InvalidateVisual() on a given region instead of entire WPF control?

    - by Scott Bilas
    I have a complex WPF control that draws a lot of primitives in its OnRender (it's sort of like a map). When a small portion of it changes, I'd only like to re-issue render commands for the affected elements, instead of running the entire OnRender over. While I'm fine with my OnRender function's performance on a resize or whatever, it's not fast enough for mouse hover-based highlighting of primitives. Currently the only way I know how to force a screen update is to call InvalidateVisual(). No way to send in a dirty rect region to invalidate. Is the lowest granularity of WPF screen composition the UI element? Will I need to do my renders of primitives into an intermediate target and then have that use InvalidateVisual() to update to the screen?

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  • Could not see memory being released on closing MFC modal dialog that hosts wpf user control using HW

    - by Naveen Chiluka
    This is in continuation with my last question posted "Continuous Memory leak while using WpfHWndSource" I have to load an WPF User Control in an MFC Modal Dialog that is being invoked from the ocx control. For this I have created a MFC Regular Dll(Mixed Mode Regular dll with clr option enabled), I have created a modal dialog which will host wpf user control using HWndSource. This exported dialog is placed as a child Dialog of the above MFC dialog that is being invoked from the ocx. Ny intermediate dialog uses C++/Cli code. When the main MFC dialog is closed, I am deleteing the ptr reference of the intermediate dialog created on the heap. In the the dipose of the .Net User Control, I have set most of the references that I have created to null, unsubscribed to the events (to avoid weak refernces), unbinded from the propertes(by using clear binding). Called delete on the HwndSource and the user control(which basically calls the dispose method). But I do not see complete memory being released. Any help would be greatful.

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  • How do I stack images to simulate depth using Core Animation?

    - by Jeffrey Berthiaume
    I have a series of UIImages with which I need to simulate depth. I can't use scaling because I need to be able to rotate the parent view, and the images should look like they're stacked visibly in front of each other, not on the same plane. I made a new ViewController-based project and put this in the viewDidLoad (as well as attached three 120x120 pixel images named 1.png, 2.png, and 3.png): - (void)viewDidLoad { // display image 3 UIImageView *three = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"3.png"]]; three.center = CGPointMake(160 + 60, 240 - 60); [self.view addSubview:three]; // rotate image 3 around the z axis // THIS IS INCORRECT CATransform3D theTransform = three.layer.transform; theTransform.m34 = 1.0 / -1000; three.layer.transform = theTransform; // display image 2 UIImageView *two = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"2.png"]]; two.center = CGPointMake(160, 240); [self.view addSubview:two]; // display image 1 UIImageView *one = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"1.png"]]; one.center = CGPointMake(160 - 60, 240 + 60); [self.view addSubview:one]; // rotate image 3 around the z axis // THIS IS INCORRECT theTransform = one.layer.transform; theTransform.m34 = 1.0 / 1000; one.layer.transform = theTransform; // release the images [one release]; [two release]; [three release]; // rotate the parent view around the y axis theTransform = self.view.layer.transform; theTransform.m14 = 1.0 / -500; self.view.layer.transform = theTransform; [super viewDidLoad]; } I have very specific reasons why I'm not using an EAGLView and why I'm not loading the images as CALayers (i.e. why I'm using UIImageViews for each one). This is just a quick demo that I can use to work out exactly what I need in my parent application. Is there some matrix way to translate these 2d images along the z-axis so they will look like what I'm trying to represent? I've gone through the other StackOverflow articles as well as the Wikipedia references, and have not found what I'm looking for -- although I might not necessarily be using the right terms for what I'm trying to do.

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  • How to get or make a WPF WebBrowser with a visual.

    - by Trainee4Life
    Having problems related to WPF WebBrowser not having a visual. Reason being, that it actually a wrapper around the winforms browser. Anyways, I searched the web for any solution to this problem, and got hold of the following suggestions: http://chriscavanagh.wordpress.com/2009/08/25/a-real-wpf-webbrowser/ http://rob.runtothehills.org/archives/60 The first one solves everything, but seems like an overkill. Plus, the dll's should be licensed for commercial use. The second one seems simple, but not able to figure out when to refresh the screen. Plus there's so much to do like sending mouse and keyboard messages to the webbrowser. P.S. The problem I'm trying to solve is to show the same webbrowser on different windows. They both must be interactive, and always in sync visually.

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  • Is there simple way to play an rtp video/audio stream in WPF?

    - by Robin
    I need to create a WPF control that will play an rtp stream with the requirement that the latency needs to be as low as possible. I've looked at the following two projects: http://vlcdotnet.codeplex.com/ http://wpfmediakit.codeplex.com/ As far as I know, I can't use VLC because we're shipping a commercial application with a more restrictive license than GPL (i.e. we can't ship our source). Wpf media kit is nice, but I can't seem to find a good/free rtp directshow source filter and I wanted to ask if there is a simpler solution out there that I'm missing before I jump into writing my own. Any ideas?

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  • POS Desktop Application using DB or Localfiles ? using WPF

    - by Panindra
    I am planning to build a POS Application for my shop. I have enough knowledge to build the application using DB and also using local files( system.IO - binary files ) to store and access the data for my application. But , i have no deployment experience and confused in choosing data storing option. Database using MDF may be good option ( may ease plenty of coding ) but i don't want to have SQL server on my desktop. as i am using WPF for building , my concern is that my application may get slow due to server response and design rendering of WPF. Then i tried to use only local data (binary files) to store the data and retrive using class and objects. but this coding is taking lot of time , so in the middle of the process i struck in the dilemma of going back to Database . Please help , for performance wise whic one is better . and in Practical World ,in professional applications which one is widely using .. please give suggestions ..

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